try, catch, finally. Зачем нужно finally?

[Felicast]

try 
{
	trace("try1");
	try 
	{
		trace("try2");
		throw new Error("error");
   	} 
	catch(e:Error) 
	{
     		trace("catch2");
		throw new Error("error");
   	} 
	finally 
	{
     		trace("finally2");
	}
} 
catch(e:Error) 
{
     	trace("catch1");
} 
finally 
{
     	trace("finally1");
}

попробуйте с finally и без